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The genus Thujopsis (Cupressaceae) comprises monoecious coniferous trees endemic to Japan. This genus includes two varieties: Thujopsis dolabrata (L.f.) Siebold et Zucc. var. dolabrata (southern variety, Td) and Thujopsis dolabrata (L.f.) Siebold et Zucc. var. hondae Makino (northern variety, Th). The aim of this study is to understand the phylogeographic and genetic population relationships of the genus Thujopsis for the conservation of genetic resources and future breeding. A total of 609 trees from 22 populations were sampled, including six populations from the Td distribution range and 16 populations from the Th distribution range. The genotyping results for 19 expressed sequence tag (EST)-based simple sequence repeat (SSR) markers, followed by a structure analysis, neighbor-joining tree creation, an analysis of molecular variance (AMOVA), and hierarchical F statistics, supported the existence of two genetic clusters related to the distribution regions of the Td and Th varieties. The two variants, Td and Th, could be defined by their provenance, in spite of the ambiguous morphological differences between the varieties. The distribution ranges of both variants, which have been defined from their morphology, was confirmed by genetic analysis. The Th populations exhibited relatively uniform genetic diversity, most likely because Th refugia in the glacial period were scattered throughout their current distribution area. On the other hand, there was a tendency for Td’s genetic diversity to decrease from central to southern Honshu island. Notably, the structure analysis and neighbor-joining tree suggest the hybridization of the two varieties in the contact zone. More detailed studies of the genetic structure of Td are required in future analyses.
Michiko Inanaga; Yoichi Hasegawa; Kentaro Mishima; Katsuhiko Takata. Genetic Diversity and Structure of Japanese Endemic Genus Thujopsis (Cupressaceae) Using EST-SSR Markers. Forests 2020, 11, 935 .
AMA StyleMichiko Inanaga, Yoichi Hasegawa, Kentaro Mishima, Katsuhiko Takata. Genetic Diversity and Structure of Japanese Endemic Genus Thujopsis (Cupressaceae) Using EST-SSR Markers. Forests. 2020; 11 (9):935.
Chicago/Turabian StyleMichiko Inanaga; Yoichi Hasegawa; Kentaro Mishima; Katsuhiko Takata. 2020. "Genetic Diversity and Structure of Japanese Endemic Genus Thujopsis (Cupressaceae) Using EST-SSR Markers." Forests 11, no. 9: 935.
Managing uncertainty is the way to secure stability of the supply chain. Uncertainty within chipping operation and chip transportation causes production loss. In the wood chip supply chain for bioenergy, operational uncertainty mainly appears in the moisture content of the material, chipping productivity, and the interval of truck arrival. This study theoretically quantified the loss in wood chip production by applying queuing theory and stochastic modelling. As well as the loss in production, the inefficiency was identified as the idling time of chipper and the queuing time of trucks. The aim of this study is to quantify the influence of three uncertainties on wood chip production. This study simulated the daily chip production using a mobile chipper by applying queuing theory and stochastic modelling of three uncertainties. The result was compared with the result of deterministic simulation which did not consider uncertainty. Uncertainty reduced the production by 14% to 27% compared to the production of deterministic simulation. There were trucks scheduled but not used. The cases using small trucks show the largest daily production amount, but their lead time was the longest. The large truck was sensitive to the moisture content of material because of the balance between payload and volumetric capacity. This simulation method can present a possible loss in production amount and enables to evaluate some ways for the loss compensation quantitatively such as outsourcing or storing buffer. For further development, the data about the interval of truck arrival should be collected from fields and analyzed. We must include the other uncertainties causing technical and operator delays.
Mika Yoshida; Katsuhiko Takata. Uncertainty Simulation of Wood Chipping Operation for Bioenergy Based on Queuing Theory. Forests 2019, 10, 822 .
AMA StyleMika Yoshida, Katsuhiko Takata. Uncertainty Simulation of Wood Chipping Operation for Bioenergy Based on Queuing Theory. Forests. 2019; 10 (9):822.
Chicago/Turabian StyleMika Yoshida; Katsuhiko Takata. 2019. "Uncertainty Simulation of Wood Chipping Operation for Bioenergy Based on Queuing Theory." Forests 10, no. 9: 822.
本研究では,小型無人マルチコプターによる空撮画像から簡易的に森林作業道を判読し,GIS データ化することを試みた。複数毎の空撮画像からオルソモザイク画像を作成し,この画像からGIS ソフトウェア上で森林作業道と判読できるところにポリラインを作成した。作成したオルソモザイク画像は非常に高い地上解像度(約3~5cm/px)であった。画像上での森林作業道も明瞭であり,実地測量結果に対して+1.0%未満の誤差で路網情報をGIS データ化することができた。小型無人マルチコプターを活用することによって,安価に高精度の路網GIS データが構築できると同時に,高地上解像度のオルソモザイク画像が誰でも簡単に作成できる利点は大きいと考えられる。本研究の結果から,小型無人マルチコプターによる森林作業道の判読手法は,十分にその有用性が高いと考えられる。また,施業により日々変化していく森林に関する情報を高頻度に収集し森林GIS にフィードバックするためのツールとして森林管理に寄与すると考えられる。
Seishiro Taki; Katsu Takata; Keisuke Inakawa. Interpretation of forestry work road networks by a small, unmanned multicopter. Japanese Journal of Forest Planning 2016, 50, 41 -49.
AMA StyleSeishiro Taki, Katsu Takata, Keisuke Inakawa. Interpretation of forestry work road networks by a small, unmanned multicopter. Japanese Journal of Forest Planning. 2016; 50 (1):41-49.
Chicago/Turabian StyleSeishiro Taki; Katsu Takata; Keisuke Inakawa. 2016. "Interpretation of forestry work road networks by a small, unmanned multicopter." Japanese Journal of Forest Planning 50, no. 1: 41-49.
The recent determination of complete chloroplast (cp) genomic sequences of various plant species has enabled numerous comparative analyses as well as advances in plant and genome evolutionary studies. In angiosperms, the complete cp genome sequences of about 70 species have been determined, whereas those of only three gymnosperm species, Cycas taitungensis, Pinus thunbergii, and Pinus koraiensis have been established. The lack of information regarding the gene content and genomic structure of gymnosperm cp genomes may severely hamper further progress of plant and cp genome evolutionary studies. To address this need, we report here the complete nucleotide sequence of the cp genome of Cryptomeria japonica, the first in the Cupressaceae sensu lato of gymnosperms, and provide a comparative analysis of their gene content and genomic structure that illustrates the unique genomic features of gymnosperms.
Tomonori Hirao; Atsushi Watanabe; Manabu Kurita; Teiji Kondo; Katsuhiko Takata. Complete nucleotide sequence of the Cryptomeria japonica D. Don. chloroplast genome and comparative chloroplast genomics: diversified genomic structure of coniferous species. BMC Plant Biology 2008, 8, 70 -70.
AMA StyleTomonori Hirao, Atsushi Watanabe, Manabu Kurita, Teiji Kondo, Katsuhiko Takata. Complete nucleotide sequence of the Cryptomeria japonica D. Don. chloroplast genome and comparative chloroplast genomics: diversified genomic structure of coniferous species. BMC Plant Biology. 2008; 8 (1):70-70.
Chicago/Turabian StyleTomonori Hirao; Atsushi Watanabe; Manabu Kurita; Teiji Kondo; Katsuhiko Takata. 2008. "Complete nucleotide sequence of the Cryptomeria japonica D. Don. chloroplast genome and comparative chloroplast genomics: diversified genomic structure of coniferous species." BMC Plant Biology 8, no. 1: 70-70.
We studied the effect of genotypes of planting stocks regarding the variation of the modulus of elasticity of tree trunks on standing trees (trunk-MOE), tree height (TH), and diameter at breast height (DBH) in a 19-year-old Japanese cedar plantation made with root cuttings. Trunk-MOE was assessed nondestructively using a tree-bending method. Genotypes of individual trees were detected using the random amplified polymorphic DNA (RAPD) technique. RAPD analysis revealed that the sampled plantation consisted of 14 genotypes. Genotypic effects on DBH and TH were unclear, and there was no significant difference among genotypes. This result indicated that an acquired variation should have more influence than an inherited variation on DBH and TH. For trunk-MOE, there were significant differences among the four largest genotypes at the 5% level. However the coefficient of variation in trunk-MOE of each genotype ranged from 7.5% to 26.8%. It seems reasonable to assume that the wide variation in trunk-MOE in a sampled plantation may depend on the environmental effect within a clone as well as on the genetic origin of clones. We therefore conclude that the use of multiple planting stocks from different cuttings for which the wood quality is unknown contributed strongly to the wide variation in trunk-MOE in the plantation of Japanese cedar.
Katsuhiko Takata; Yukio Teraoka. Genotypic effects on the variation of wood quality and growth traits in plantation forest made by cutting cultivars of Japanese cedar. Journal of Wood Science 2002, 48, 106 -113.
AMA StyleKatsuhiko Takata, Yukio Teraoka. Genotypic effects on the variation of wood quality and growth traits in plantation forest made by cutting cultivars of Japanese cedar. Journal of Wood Science. 2002; 48 (2):106-113.
Chicago/Turabian StyleKatsuhiko Takata; Yukio Teraoka. 2002. "Genotypic effects on the variation of wood quality and growth traits in plantation forest made by cutting cultivars of Japanese cedar." Journal of Wood Science 48, no. 2: 106-113.